remove duplicate lines of code

main.py

@@ -66,8 +66,6 @@ app.config['LDAP_USER_DN'] = 'ou=users'
 app.config['LDAP_GROUP_DN'] = 'ou=groups'
 app.config['LDAP_USER_RDN_ATTR'] = 'uid'
 app.config['LDAP_USER_LOGIN_ATTR'] = 'uid'
-app.config['LDAP_BIND_USER_DN'] = None
-app.config['LDAP_BIND_USER_PASSWORD'] = None
 app.config['LDAP_GROUP_OBJECT_FILTER'] = '(objectclass=posixGroup)'
 app.config['LDAP_BIND_USER_DN'] = None
 app.config['LDAP_BIND_USER_PASSWORD'] = None